Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Polyembryony
Presence of more than one embryo in a seed is termed polyembryony. The phenomenon, first discovered in orange seeds by Leeuwenhoek (1719), attracted considerable attention because of its potential for application in and horticulture. Polyembryony is broadly classified into simple and multiple, depending on whether the supernumerary arises in one or more embryo sacs in the ovule. Simple polyembryony may be sexual or asexual. In sexual polyembryony embryos may originate from the fertilized egg and synergids, or by budding or cleavage of the polyembryony cells or suspensor of the zygotic embryo.
Asexual embryos are produced within the embryo sac without fertilization. Embryos may also originate from diploid nucellar or integumentary cells of the ode and grow into the embryo sac. These embryos are termed adventive or sporophytic. Multiple polyembryonies involve production of accessory embryos from two or more embryo sacs in the same ovule. For example, in the sea Island cotton, Gossypium barbadense, fertilization of egg in one embryo sac stimulates the induction of embryo from an unfertilized egg in the adjacent embryo sac within the same ovule. Thus, diploid-haploid twin embryos are produced in the seed.
The potassium-sparing agents spironolactone, triamterene, and amiloride are often useful in combination with the loop diuretics and thiazides. Triamterene and amiloride act on the
Define Body Building functions of proteins? The primary functions of proteins, as you might be aware, is tissue growth and maintenance. Protein contains amino acids - the build
Define the Stages of ConvaIescenca - Nutrition during Stress? This period of catabolism and alteration of the hormonal environment is known as the 'adrenergic - corticoid phase
Classification of proteins based on chemical properties? Depending on their chemical properties and optical activity, the amino acids in proteins are classified under the follo
What is Classic Blalock-Taussig BT Shunt in Shunt Operations ? Subclavian artery, which arises from innominate artery, is anastomosed to pulmonary artery. In a patient with lef
Theories are import because they can be used to a. Test research hypothesis b. Develop questions which will facilitate more effective research c. Conduct more meaningful and useful
Adhesion of Cells to Extracellular Cell Matrix You know that the cells in order to move or change shape, adhere to each other or to the substratum in their environment. Usual
From your studies in ecology, you must be aware that most ecosystems are quite complex consisting of several habitats and that habitats in turn are composed of microhabitats. Each
what are the adaptations of amoeba
Q. What are the vessels that carry blood to the kidneys? Is this blood venous or arterial? The renal arteries are ramifications of the aorta and so the blood filtered by the ki
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd